AT&T Callmaster Series Reference Manual page 432

2500 MMGL and 2500 YMGL Telephones
FLASH button
REDIAL button
HOLD button
MUTE button
Pressing and holding the MUTE button down blocks your conversation from being heard by the
other party.
FLASH button
The FLASH button performs the same function as flashing the switchhook; that is, it provides
access to system features or use of custom calling services that require a press of the
switchhook.
REDIAL button
The REDIAL button is used to dial the last number dialed (up to 28 digits).
HOLD button
The HOLD button is used to put a call on hold. Below the HOLD button, there is a red light.
When the user puts a call on hold, the light goes on.
Message light
The red Message light flashes when a message has been left, and flutters when a call is being
received. The telephones recognize either LED or neon message waiting signals.
Positive Disconnect
The Positive Disconnect switch on the bottom of the telephone has two positions: ON and OFF.
The ON position hangs up the telephone for approximately two seconds, even if the
switchhook depression is less. This prevents inadvertent switchhook flashes. To initiate
switchhook flash in this mode, press the FLASH button.
In the OFF position, the switchhook will function normally.
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